Terminals Of Ecu

Fig 1: Identifying Meter ECU Connector L10

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1. Measure the resistance and voltage according to the value(s) in the table below.

   Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
   L10-1 (B) - Body ground	G - Body ground	Turn signal L	Engine switch on (IG), turn signal LH indicator light OFF	Below 1 V
   			Engine switch on (IG), turn signal LH indicator light ON	Alternating between below 1 and 11 to 14 V
   L10-2 (PBLT) - Body ground	SB - Body ground	Seat belt condition signal (Passenger side)	Passenger seat belt indicator is OFF	Below 1 V
   			Passenger seat belt indicator blinks	Alternating between below 1 and 11 to 14 V
   L10-4 (A/B) - Body ground	B - Body ground	ODO/TRIP signal	Engine switch on (IG), ODO/TRIP switch ON	Below 1 V
   			Engine switch on (IG), ODO/TRIP switch OFF	4.4 to 5.5 V
   L10-5 (RSET) - Body ground	BR - Body ground	TRIP RESET signal	Engine switch on (IG), TRIP RESET switch ON	Below 1 V
   			Engine switch on (IG), TRIP RESET switch OFF	4.4 to 5.5 V
   L10-7 (RHDW) - Body ground	L - Body ground	Light control rheostat DOWN signal	Engine switch on (IG), Light control rheostat DOWN switch ON	Below 1 V
   			Engine switch on (IG), Light control rheostat DOWN switch OFF	4.4 to 5.5 V
   L10-8 (RHUP) - Body ground	R - Body ground	Light control rheostat UP signal	Engine switch on (IG), Light control rheostat UP switch ON	Below 1 V
   			Engine switch on (IG), Light control rheostat UP switch OFF	4.4 to 5.5 V
   L10-9 (SI) - Body ground	L - Body ground	Speed signal (Input)	Engine switch on (IG) and turn the wheel slowly	Pulse generation (See waveformFig 2)
   L10-10 (+S) - Body ground	V - Body ground	Speed signal (Output)	Engine switch on (IG) and turn the wheel slowly	Pulse generation (See waveform Fig 2)
   L10-11 (EFI) - Body ground	R - Body ground	MIL	MIL ON	Below 1 to 4.2 V
   			MIL OFF	11 to 14 V
   L10-12 (B) - Body ground	Y - Body ground	Turn signal R	Engine switch on (IG), turn signal RH indicator light OFF	Below 1 V
   			Engine switch on (IG), turn signal RH indicator light ON	Alternating between below 1 and 11 to 14 V
   L10-13 (B) - Body ground	P - Body ground	Battery	Always	11 to 14 V
   L10-14 (IG2) - Body ground	L - Body ground	Engine switch signal	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   L10-16 (ILL-) - Body ground	LG - Body ground	Illumination signal	Engine switch on (IG)	Pulse generation
   L10-17 (E2) - Body ground	W-B - Body ground	Ground (Power ground)	Always	Below 1 Ω
   L10-18 (ES) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
   L10-24 (EPB*) - Body ground	L - Body ground	Brake fluid level warning light signal	Engine switch on (IG), BRAKE warning light ON	Below 1 V
   			Engine switch on (IG), BRAKE warning light OFF	Pulse generation

   HINT: 

   *: Stands for electric parking brake

   • If the result is not as specified, the meter may have a malfunction.
2. Using an oscilloscope, check the waveform.
   Fig 2: Identifying Waveform Graph

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   WAVEFORM (REFERENCE)
   
   

   Item	Condition
   Terminal No. (Symbols)	L10-10 (+S) - Body ground L10-9 (SI) - Body ground
   Tool setting	5 V/DIV., 20 msec./DIV.
   Vehicle condition	Engine switch on (IG) and turn the wheel slowly ex.) Driving at approx. 20 km/h (12 mph)

   HINT: 

   As vehicle speed increases, the cycle of the signal waveform narrows.

Fig 3: Identifying Meter ECU Inner Circuit (1 of 3)

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Fig 4: Identifying Meter ECU Inner Circuit (2 of 4)

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Fig 5: Identifying Meter ECU Inner Circuit (3 of 4)

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Fig 6: Identifying Meter ECU Inner Circuit (4 of 4)

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This diagram shows all the indicators that are provided, which may differ from the actual vehicle.